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Sperm competition is a form of post-copulatory sexual selection  whereby male ejaculates simultaneously physically compete to fertilize a single ovum. Physiological evidence, including testis size relative to body weight and the volume of sperm in ejaculations, suggests that humans have experienced a low-to-intermediate level of selection pressure for sperm competition in our evolutionary history. Evidence suggests that, among the great apes, relative testis size is associated with the breeding system of each primate species.
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- Sperm competition is the competitive process between spermatozoa of two or more different males to fertilize...